﻿(function ($) {

    $.extend({
        metadata: {
            defaults: {
                type: 'class',
                name: 'metadata',
                cre: /({.*})/,
                single: 'metadata'
            },
            setType: function (type, name) {
                this.defaults.type = type;
                this.defaults.name = name;
            },
            get: function (elem, opts) {
                var settings = $.extend({}, this.defaults, opts);
                // check for empty string in single property
                if (!settings.single.length) settings.single = 'metadata';

                var data = $.data(elem, settings.single);
                // returned cached data if it already exists
                if (data) return data;

                data = "{}";

                var getData = function (data) {
                    if (typeof data != "string") return data;

                    if (data.indexOf('{') < 0) {
                        data = eval("(" + data + ")");
                    }
                }

                var getObject = function (data) {
                    if (typeof data != "string") return data;

                    data = eval("(" + data + ")");
                    return data;
                }

                if (settings.type == "html5") {
                    var object = {};
                    $(elem.attributes).each(function () {
                        var name = this.nodeName;
                        if (name.match(/^data-/)) name = name.replace(/^data-/, '');
                        else return true;
                        object[name] = getObject(this.nodeValue);
                    });
                } else {
                    if (settings.type == "class") {
                        var m = settings.cre.exec(elem.className);
                        if (m)
                            data = m[1];
                    } else if (settings.type == "elem") {
                        if (!elem.getElementsByTagName) return;
                        var e = elem.getElementsByTagName(settings.name);
                        if (e.length)
                            data = $.trim(e[0].innerHTML);
                    } else if (elem.getAttribute != undefined) {
                        var attr = elem.getAttribute(settings.name);
                        if (attr)
                            data = attr;
                    }
                    object = getObject(data.indexOf("{") < 0 ? "{" + data + "}" : data);
                }

                $.data(elem, settings.single, object);
                return object;
            }
        }
    });

    /**
     * Returns the metadata object for the first member of the jQuery object.
     *
     * @name metadata
     * @descr Returns element's metadata object
     * @param Object opts An object contianing settings to override the defaults
     * @type jQuery
     * @cat Plugins/Metadata
     */
    $.fn.metadata = function (opts) {
        return $.metadata.get(this[0], opts);
    };

})(jQuery);